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HubbleSite Hint of Planet-Sized Drifters Bewilders Hubble Scientists

  • Thread starter Space Telescope Science
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Space Telescope Science

Piercing the heart of a globular star cluster, NASA's Hubble Space Telescope uncovered tantalizing clues to what could be a strange and unexpected population of wandering, planet-sized objects. The orbiting observatory detected these bodies in the globular cluster M22 by the way their gravity bends the light from background stars, a phenomenon called microlensing. These microlensing events were unusually brief, indicating that the mass of the the intervening objects could be as little as 80 times that of Earth. Bodies this small have never been detected by microlensing observations.

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